Parameter Description
Overflow behaviour This parameter controls the behavior of the function block when the
int
ernal counter has reached the maximum value and then another
counting pulse occurs at the Up input.
•
No overflow function
All other rising signal edges at the Up in
put are ignored.
•
N
o overflow function
°
The Overflow output is 1 for the duration of a logic cycle.
°
The value of the internal counter is set to 0.
Underflow behaviour This parameter controls the behavior of the function block when the
int
ernal counter has reached the value 0 and then another counting
pulse occurs at the Down input.
•
Underflow function
All other rising signal edges at the D
own input are ignored.
•
N
o underflow function
°
The Underflow output is 1 for the duration of a logic cycle.
°
The value of the internal counter is set to the Maximum value
parameter.
Maximum value 1 … 65,535
T
he value must be greater than or equal to Reload value.
Reload value 0 … 65,535
T
he value must be less than or equal to the Maximum value parameter.
7.6.2.4 Function blocks for input evaluation
7.6.2.4.1 Two hand control (2 inputs) V1
Overview
T
his function block provides the logic for monitoring the inputs of a two-hand control
device. The category 1 (Type IIIA) or category 4 (Type IIIC) according to EN 574 depends
on the wiring and parameterization.
Principle of operation
Table 72: Inputs
Input Description
1A (NO)
1B (N
C)
Data type: Boolean
Table 73: Outputs
Output Description
Enable Data type: Boolean
•
0 = no
t enabled
•
1 = enabled
The Enable out
put is set to 1 if the following conditions are met:
°
Bo
th inputs are inactive at the same time for at least the dura‐
tion of the logic execution time
°
Both inputs are then active
Synchronization status Data type: Boolean
•
0 = Er
ror
Synchronization time exceeded.
•
1 = N
o error or unknown
CONFIGURATION 7
8024589/2020-11-10 | SICK O P E R A T I N G I N S T R U C T I O N S | Flexi Compact
73
Subject to change without notice
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